Rhythm machines - KR Mini/Volca Beats

I am technically challenged when it comes to things like that, so I want a simple way to set up drum patterns. I have had the DR Rhythm for a long time and I never figured out how to adequately program my own drum patterns into it.

I just need it for practicing and composing. The Volca beats sounds great but appears to be even harder to figure out than what I already have. The Mini appears to be limited, but probably all I need.